1. Wille, R.: Restructuring lattice theory: an approach based on hierarchies of concepts. Ordered Sets 87, 445–470 (1982)
2. Osthuizen G.D.: The application of concept lattice to machine learning. Technical report, University of Pretoria, South Africa (1996)
3. Ho, T.B.: Incremental conceptual clustering in the framework of Galois lattice. In: Lu, H., Motoda, H., Liu, H. (eds.) KDD: Techniques and Applications, pp. 49–64. World Scientific, Singapore (1997)
4. Kent R.E., Bowman C.M.: Digital libraries, conceptual knowledge systems and the nebula interface. Technical report, University of Arkansas (1995)
5. Corbett D., Burrow A.L.: Knowledge reuse in SEED exploiting conceptual graphs. In: International Conference on Conceptual Graphs, pp. 56–60. University of New South Wales, Sydney (1996)